Centrifugal blower.



J. S. MELGHBRS.

GBNTBIFUGAL BLOWER.

Prummel Hmm JULY e, 1an.

1,109,133, Patenfed Sept. 1,1914.

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WITNESSES: INI/E Nl? By Y -T E Ymjw A 7TORNEY narran stratrps PATENT OFFICE.

JOHN S. MELCHES, OF NEW YORK, N. Y.

CENTRIFUGAL. BLOWER.

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ers of the volute type, in which air is drawn in at the center of a. fan eccentrically disposed in a containing chamber and dis-- charged at the ends of the fan-blades.

It is directed especially to the compoundy ing of blowers. the securing of silent operation, the reduction of undesirable back-pressures and the Aminimi/.ing of temperature rises in the apparatus. I attain these various objects by the construction, arrangement and combination of the parts illustrated in the drawinfs attached hereto and hereinafter described, in the course of which description I will point out how the specific objects and advantages are secured.

In the. accompanying drawings, Figure 1 is 'a plan view, of a quadri-compound blower 'embodyinguny invention, driven by'electric inc-tor; Fig. 2 is a cross-section view of such blo-wer Aat the line ca -m ot' Fig. 1, looking toward the motor.

Like reference numerals apply to like parts.

toter-ring now to the drawings, it may be i said that any desiredl prime mover maybe employed to drive the blower, but in Fig. 1 I have, 'lor convenience, shown such prime mover as an elcctric'motor 1, directly connected tothe blower shaft 2 uponwhich are mounted the fans 3, 3', 3, 3 used for compounding or stepping-up the pressures to be secured. Each fan is in its own volute chamber 4 (or 4C', 4, 4m), being eccentrically mounted therein so as to have the ends of the fan-blades nearer the wall of the chamber atone point than'at any others, as shown more clearly in Fig. 2. Each fan 3, etc., has an auxiliary chamber 5 (or 5", 5, 5), into which it exhausts its compressed air; in the preferred embodiment of my invention illustrated, the last compression chamber 5 surrounds` all the fan-chambers and other compression chambers; for reasons which will presently appear. vAt one end of the device is an intake chamber 6 with an Specification of Letters Patent. i Patented; Sept. 1, 1914. Application inea my s, 1911. semi No. essere.

fan 3 draws its air through the opening 11 from the intake-.chamber 6, near the center of the fan.. Each fan-chamber 4, for example, opens into its compression-chamber 5 by way of an open port 9, the air being deflected into the chamber 5 by the slanting partition 10 and the, eccentric Wall 14 of the volute fanl chamber 4l.- When more'than a. single blower unit is employed, 'air may be taken from any compression-chamber 5, 5', 5, 5'", each chamber furnishin a different pressure. Fig. 1 shows two alr-taps 12 and 13, which may be of a. size depending on the quantity of air to be: used, theoutlet 12 supplying air at a higher pressure than the outlet 13. ,v

A blower embodying features of my invention may comprise a rotary fan 3, la volute fan-c amber 4, an air-inlet 11, an outlet 9 into a compression-chamber 5, from which the compressed air may be drawn. This ywould be a. single-unit blower. of such units would form a. compoundblower', giving higher" pressures. higher compression may be secured by tricompound'in-g through the use of threeunits, etc. Whatever 'the number of units employed, there-is a. compression-chamber between each two fan-chambers. The use of a high-speed blower without my compressionchamber is accompanied by a roar or rumble which is very dlsagreeable and annoying, particularly as the principal use for such blower is in connection with church organs Still I, entrance-port 8 and flap-valve? the first Two and the like. The use of my compressionchambers acts to dampen the vibrations of the fan and an-'casings and renders the operation of the device substantially no-iseless. The surrounding chamber" serving as compression-chamber for the last'blower-an, adds to the general effectiveness in this regard. I am able to avoid the use of a thrust bearing on my fan-shaft by reason of the steadying action of the compression-chambers on the fans; this is a new and highly-useful.

feature.. Another advantage coming from the use of my invention lies in the fact that the temperature of the air is keptv low through the use of my compression chambers and the arrangement of parts. It will be understood that achurch-organ is not played constantly through a service, but that it must be kept ready to play at substantially any time desired; this means that the fans must be kept revolving even if no air is being lio drawn into the organ. I have lfound that where my compression chamber is employed the temperature of the air in the blower will not rise more than about 10 F. above the temperature of. the surrounding air within 30 minutes whereas the simple churning of the air without a compression-chamber will raise its temperature'QOo or more above that point within the same time; this improved action with my device is doubtless due to the larger volume of air acted upon by each fan and the -opportunity aiiorded for more or less circulation of the air in and out of the compression-chamber with consequently improved radiation. I have found that the best results are secured where the compression-chamber is of substantially `the maximum width of the fanlblades.

I do not desire to-limit my invention to the precise embodiment of it which I have here illustrated and described, but

What I claim and wish to protect by Let# ters-Patent of the United States is:

l. A compound centrifugal blower comprising a plurality of fans, a volute fanchamber for each fan, a compression chamber interposed between each pair of fanchambers and one or more outlets for the compressed air. v

2. A compound centrifugal blower comprising a plurality of fans, a volute fanchamber for each fan, a compression-chamber interposed between leach pair of fanchambers and a high-pressure chamber surrounding the several blower units.

3. A centrifugal blower consisting of a fan, a fan-chamber with an air-inlet near the center of vthefan, an air-outlet, such as 9,

maqma pressed air may be stored without being i churned by the fans.

5. In a compound centrifugal blower comprising a pluralit of fans each in its own chamber, means or suppressing the vibration of the walls thereof consisting in the provision of a separate' compression chamer for each fan chamber, one of such compression chamberssubstantially surrounding the fan chambers.

6. A compound centrifugal blower comprising a pluralit of fans, a volute fan` chamber for each an, a compression chamber interposed between' each pair of an chambers, and an outlet for the compressed air.

7. In acompound centrifugal blower comprising a plurality of fans and a volute fan chamber for each fan, a storage chamber adetv jacent each fan chamberfwithin which the compressed air maybe stored without being churned by the fans. 1.

JOHN S. MELCHERS. Witnesses:

i EDWIN W. HAMMER, JOHN S. MCCARTHY. 

